TUNING A SELF-CONSISTENT VISCOPLASTIC MODEL BY FINITE-ELEMENT RESULTS .2. APPLICATION TO TORSION TEXTURES

In part one of the present work, a self consistent model is described which is based on the approach of Molinari et al. [Acta metall. 35, 2983 (1987)] and on the finite element results of Gilormini and Germain [Int. J. Solids Struct. 23, 413 (1987)]. In that work, a scalar interaction parameter is introduced by tuning the self consistent predictions with the finite element results. In the present paper, the new model is applied for the large strain simulation of torsion texture development and compared with experimental results. The simulations reveal that the new approach leads to predictions which are much nearer to the experimental results than those which can be obtained by the Taylor model or by the pure tangent formulation of the self consistent model. An important effect of the grain shape changes on the evolution of anisotropy at large strains is also confirmed.